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EP3443243B1 - Hollow shaft lubricant circuit - Google Patents

Hollow shaft lubricant circuit Download PDF

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Publication number
EP3443243B1
EP3443243B1 EP17713750.2A EP17713750A EP3443243B1 EP 3443243 B1 EP3443243 B1 EP 3443243B1 EP 17713750 A EP17713750 A EP 17713750A EP 3443243 B1 EP3443243 B1 EP 3443243B1
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EP
European Patent Office
Prior art keywords
cannula
hole
screw
tip
lubrication circuit
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Application number
EP17713750.2A
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German (de)
French (fr)
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EP3443243A1 (en
Inventor
Stephane Pomas
Didier BULTEZ
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PSA Automobiles SA
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PSA Automobiles SA
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Publication date
Application filed by PSA Automobiles SA filed Critical PSA Automobiles SA
Publication of EP3443243A1 publication Critical patent/EP3443243A1/en
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Publication of EP3443243B1 publication Critical patent/EP3443243B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/042—Guidance of lubricant
    • F16H57/0421—Guidance of lubricant on or within the casing, e.g. shields or baffles for collecting lubricant, tubes, pipes, grooves, channels or the like
    • F16H57/0426—Means for guiding lubricant into an axial channel of a shaft

Definitions

  • the invention relates to a circuit for lubricating a hollow shaft, to a gearbox comprising this circuit, and to a vehicle comprising such a gearbox.
  • the document FR2956460 describes such a lubrication circuit.
  • the invention is particularly but not limited to applications in the field of transmission systems of motor vehicles and in particular the gearboxes of these vehicles.
  • the patent document FR-A-2 877 065 discloses a gearbox for a motor vehicle comprising an output shaft rotatably mounted in a housing, gear wheels rotatably mounted on the output shaft for different speeds and a device for forced lubrication of the gear wheels comprising a cannula for supplying lubricant to an axial bore of the output shaft opening outwards through radial channels.
  • This document also discloses a gearbox stack held axially on the output shaft by being wedged between a shoulder of the output shaft, and a washer. The assembly is blocked by means of a screw screwed into the output shaft, the screw being traversed by the cannula.
  • This type of cannula requires radial play between the cannula and the axial bore of the shaft or of the screw, so as not to induce mechanical losses by friction.
  • the cannula and the parts carrying the cannula must be precisely positioned relative to the axial bore of the shaft or of the screw, in order to be able to comply with this radial play.
  • the screw by virtue of its geometric tolerances and its assembly screwed into the shaft, does not allow such precision, and forces this radial clearance to be increased, which aggravates the aforementioned drawback.
  • the aim of the invention is to remedy the aforementioned drawbacks.
  • the invention relates to a lubrication circuit for a hollow rotating shaft comprising a fixed cannula for supplying a lubricant into one end of the hollow rotating shaft, this end having a screw coaxial with the hollow shaft, this screw comprising a coaxial through hole, this circuit further comprising a tip arranged as an extension of the cannula, this tip having an axial bore and an elastic lip, and the elastic lip being radially supported in the through hole.
  • the end piece and its elastic lip resting radially in the through hole makes it possible to seal the lubrication circuit and maintain the integrity of this seal even if the through hole has geometric dispersions relative to the end piece. , such as a defect in the coaxiality of the screw in the hollow shaft for example.
  • the elasticity of the lip makes it possible to keep the radial support between the lip and the through hole, by elastic deformation of the lip.
  • the shape of the lip makes it possible to tolerate the large geometric dispersions of the screw or, from an assembly point of view, allows a greater dispersion in the positioning of the cannula with respect to the through hole.
  • the shape of the lip also makes it possible to facilitate centering of the cannula with respect to the through hole.
  • this embodiment allows the sealing of the oil circuit while having a mounting of the cannula with respect to the screw that is more permissive in terms of geometric dispersions.
  • the elastic lip is positioned in the head of the screw.
  • the through hole has at least two different diameters, and the diameter of the hole in the tip is equal to or greater than the smallest of the diameters of the through hole.
  • the bore diameter of the end piece in order not to add a pressure drop to the flow of lubricant in the lubrication circuit, it is advantageous for the bore diameter of the end piece to be at least equal to the smallest diameter of the through hole.
  • the elastic lip has a taper, the apex of which is oriented towards the hollow shaft.
  • the elastic lip being in the form of a truncated cone in order to be able to rest on the entire periphery of the through-hole, has a preferred mounting direction. It is then advantageous for the elastic lip to be oriented in the direction which allows natural axial sliding of the elastic lip in the through hole when the end piece is introduced into the through hole. This also has the advantage of not damaging the lip when it is mounted in the through hole.
  • the end piece is molded onto the cannula.
  • this embodiment also makes it possible to guarantee the mechanical connection and the lubricant seal at the same time, between the cannula and the nozzle.
  • the end piece is fitted onto the cannula and held by clips.
  • this simple embodiment makes it possible to guarantee the mechanical connection and the lubricant-tightness at the same time, between the cannula and the nozzle.
  • the end piece is made of plastic, elastomer, or polytetrafluoroethylene.
  • the end piece and its lip are made of an elastic material, the stiffness of which is sufficient to guarantee the radial support of the lip in the through hole.
  • the elastic lip and the end piece are made of two different materials by a bi-injection process.
  • the end piece is made of a first material whose stiffness is sufficient to guarantee the mechanical retention of the end piece on the cannula, while having an elastic lip in a second material whose elasticity is sufficient to ensure the radial support of the lip in the through hole without the radial support being excessive.
  • a subject of the invention is also a gearbox comprising at least one lubrication circuit as described above.
  • a subject of the invention is also a vehicle comprising at least one gearbox as described above.
  • the set represented on the figure 1 comprises a lubrication circuit for a hollow rotating shaft 6 comprising a fixed cannula 3 for supplying a lubricant, such as oil, into one end of the hollow rotating shaft 6, this end having a coaxial screw 7 to the hollow shaft 6, this screw 7 comprising a coaxial through hole 11.
  • a lubricant such as oil
  • This lubrication circuit further comprises a tip 8 arranged as an extension of the cannula 3, this tip 8 having an axial bore 19 and an elastic lip 9, the elastic lip 9 resting radially in the through hole 11.
  • the screw 7 of this example comprises a screw head 12 and a screw body 13, and the through hole 11 has two different constant diameters, the largest diameter of which is a head bore 10 housed in the screw head 12, the elastic lip 9 being positioned in the screw head 12 and resting on the head bore 10. In the rest state or not mounted in the through hole 11, the lip 9 has a larger diameter than that of the bore head 10. When the lip 9 is positioned in the head bore 10, it is compressed so as to be prestressed by its elasticity. This elastic lip 9 is preloaded in the head bore 10, so as to be able to rest on the head bore 10 despite dispersions in geometry and in the positioning of the screw 7 in the hollow rotating shaft 6.
  • the elastic lip 9 being positioned to rest on this head bore 10, this also makes it possible to accommodate a part of the end piece 8 in this head bore 10.
  • the axial bore diameter 19 of the nozzle 8 is less than the diameter of a body bore 15, this body bore 15 corresponding to the diameter of the through hole 11 in the screw body 13. This diameter of the body bore 15 is the smallest diameter of the through hole 11.
  • the axial bore diameter 19 of the end piece 8 is greater than or equal to the diameter of the body bore 15.
  • the head bore 10 and the body bore 15 are connected by a frustoconical part of the through hole 11, this frustoconical part and these two bores 10, 15, forming the whole of the through hole 11.
  • the through hole 11 may have any other shape, the lip 9 bearing on a diameter of the hole 11 equal to or greater than the smallest of the diameters of the hole 11.
  • the elastic lip 9 has a taper, the apex of which is oriented towards the hollow shaft 6.
  • the nozzle 8 is molded onto the cannula 3, so that the cannula 3 also serves as a frame in the nozzle 8. Asperities 17 of the cannula 3, such as stampings, holes, or cutouts, protrude into the nozzle. material of the end piece 8 so as to complete the mechanical connection between these two parts.
  • the end piece 8 is force-fitted onto the cannula 3, in a diameter inside the cannula 3, or around a diameter outside the cannula 3, or both at the same time.
  • the end piece 8 is fitted onto the cannula 3, and held by clips (not shown).
  • the fitting is made in the inner diameter of the cannula 3, or around the outer diameter of the cannula 3, or both at the same time.
  • the clips are made by complementarity of shape between the cannula 3 and the tip 8, using the elasticity of the material of the tip 8.
  • the end piece 8 is made of elastomer, a material which presents an ideal compromise between stiffness and elasticity, but could also be made of plastic, in particular of polyamide and more particularly of polyhexamethylene adipamide PA6.6, or based on polytetrafluoroethylene.
  • the elastic lip 9 and the end piece 8 are made of two different materials by a bi-injection process.
  • the tip is then made of a first material.
  • the stiffness of this first material is chosen to be sufficient to guarantee the mechanical retention of the end piece 8 on the cannula 9.
  • the elastic lip 9 is made of a second material. The elasticity of this second material must be sufficient to guarantee the radial support of the lip 9 in the through hole 11, here the head bore 10, without the radial support being excessive.
  • This lubrication circuit is part, for example, of a gearbox 1 comprising a stack of gears (not shown) and of bearings 16 on the hollow shaft 6, for example idler gears, and the screw 7 is a blocking of this stack on the hollow shaft 6.
  • the hollow shaft 6 is rotating relative to a housing 2 of the gearbox 1, and the cannula 3 is fixed relative to this housing 2, and is fixed thereto by means of a cover 4 of the housing 2. In this way, the hollow shaft 6 is in rotation with respect to the cannula 3.
  • the end piece 8 being an extension of the cannula 3, the hollow shaft 6 is also in rotation with respect to the end piece 8, the latter being fixed relative to the cannula 3.
  • the cover 4 of the housing 2 has an isostatism (not shown) with respect to the housing 2 of two to three degrees of freedom, and the end piece 8 is then a centralizer of the cover 4.
  • the cover 4 of the housing 2 has an isostatism (not shown) with respect to the housing 2 without degrees of freedom. All the geometric dispersions resulting from a chain of dimensions connecting the end piece 8 to the through hole 11 are absorbed by the elasticity of the lip 9.
  • the cannula 3 supplies the hollow shaft 6 with oil by means of a pump (not shown) allowing the oil to be pressurized. It is also possible to replace the oil pump with a gravity-fed oil recovery system, for splash lubrication systems.
  • the gearbox 1 is, for example, integrated into the transmission of a vehicle, in particular of a motor vehicle.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Details Of Gearings (AREA)
  • Flexible Shafts (AREA)

Description

L'invention porte sur un circuit de lubrification d'un arbre creux, sur une boîte de vitesses comprenant ce circuit, et sur un véhicule comprenant une telle boîte de vitesse. Le document FR2956460 décrit un tel circuit de lubrification.The invention relates to a circuit for lubricating a hollow shaft, to a gearbox comprising this circuit, and to a vehicle comprising such a gearbox. The document FR2956460 describes such a lubrication circuit.

L'invention vise notamment mais pas limitativement, des applications dans le domaine des systèmes de transmission des véhicules automobiles et en particulier les boîtes de vitesses de ces véhicules.The invention is particularly but not limited to applications in the field of transmission systems of motor vehicles and in particular the gearboxes of these vehicles.

Dans ce domaine, une lubrification efficace des pièces tournantes conditionne la durée de vie des transmissions, ainsi qu'une limitation des pertes mécaniques par frottement. Des organes complexes, comme les boîtes de vitesses, sont sensibles à ces deux phénomènes de par le nombre important de pièces ajustées en rotation dans un environnement contraint mécaniquement et thermiquement.In this field, effective lubrication of rotating parts determines the service life of transmissions, as well as limitation of mechanical friction losses. Complex components, such as gearboxes, are sensitive to these two phenomena due to the large number of parts adjusted to rotate in a mechanically and thermally constrained environment.

Le document de brevet FR-A-2 877 065 divulgue une boîte de vitesses pour véhicule automobile comprenant un arbre de sortie monté rotatif dans un carter, des roues d'engrenages montées de manière rotative sur l'arbre de sortie pour les différentes vitesses et un dispositif de lubrification forcée des roues d'engrenages comprenant une canule d'alimentation en lubrifiant d'un alésage axial de l'arbre de sortie débouchant vers l'extérieur par des canaux radiaux. Ce document divulgue également un empilage de boîte de vitesses maintenu axialement sur l'arbre de sortie en étant coincé entre un épaulement de l'arbre de sortie, et une rondelle. Le blocage de l'ensemble est réalisé par l'intermédiaire d'une vis vissée dans l'arbre de sortie, la vis étant traversée par la canule.The patent document FR-A-2 877 065 discloses a gearbox for a motor vehicle comprising an output shaft rotatably mounted in a housing, gear wheels rotatably mounted on the output shaft for different speeds and a device for forced lubrication of the gear wheels comprising a cannula for supplying lubricant to an axial bore of the output shaft opening outwards through radial channels. This document also discloses a gearbox stack held axially on the output shaft by being wedged between a shoulder of the output shaft, and a washer. The assembly is blocked by means of a screw screwed into the output shaft, the screw being traversed by the cannula.

Ce type de canule nécessite un jeu radial entre la canule et l'alésage axial de l'arbre ou de la vis, de sorte à ne pas induire des pertes mécaniques par frottement.This type of cannula requires radial play between the cannula and the axial bore of the shaft or of the screw, so as not to induce mechanical losses by friction.

Un inconvénient de ce jeu radial est que de l'huile s'échappe par ce jeu, sans avoir pu participer à la lubrification des pièces en rotation.A drawback of this radial clearance is that oil escapes through this clearance, without having been able to participate in the lubrication of the rotating parts.

De plus, la canule et les pièces portant la canule, doivent être précisément positionnées par rapport à l'alésage axial de l'arbre ou de la vis, pour pouvoir respecter ce jeu radial. Or la vis, de par ses tolérances géométriques et son assemblage vissé dans l'arbre, ne permet pas une telle précision, et oblige à augmenter ce jeu radial, ce qui aggrave l'inconvénient précité.In addition, the cannula and the parts carrying the cannula must be precisely positioned relative to the axial bore of the shaft or of the screw, in order to be able to comply with this radial play. Now, the screw, by virtue of its geometric tolerances and its assembly screwed into the shaft, does not allow such precision, and forces this radial clearance to be increased, which aggravates the aforementioned drawback.

Un autre inconvénient consiste en ce que la canule traverse le corps creux de la vis, ce qui fait que la section minimale de passage d'huile de la canule est inférieure à celle de la vis, défavorisant l'écoulement de l'huile dans la canule.Another drawback is that the cannula passes through the hollow body of the screw, which means that the minimum oil passage section of the cannula is less than that of the screw, preventing the flow of oil in the screw. cannula.

Le but de l'invention est de remédier aux inconvénients précités.The aim of the invention is to remedy the aforementioned drawbacks.

A cet effet, l'invention a pour objet un circuit de lubrification d'un arbre tournant creux comportant une canule fixe d'amenée d'un lubrifiant dans une extrémité de l'arbre tournant creux, cette extrémité ayant une vis coaxiale à l'arbre creux, cette vis comprenant un trou coaxial traversant, ce circuit comportant en outre un embout disposé en prolongement de la canule, cet embout ayant un perçage axial et une lèvre élastique, et la lèvre élastique étant en appui radial dans le trou traversant.To this end, the invention relates to a lubrication circuit for a hollow rotating shaft comprising a fixed cannula for supplying a lubricant into one end of the hollow rotating shaft, this end having a screw coaxial with the hollow shaft, this screw comprising a coaxial through hole, this circuit further comprising a tip arranged as an extension of the cannula, this tip having an axial bore and an elastic lip, and the elastic lip being radially supported in the through hole.

En effet, l'embout et sa lèvre élastique en appui radial dans le trou traversant permet de réaliser une étanchéité du circuit de lubrification et de garder l'intégrité de cette étanchéité même si le trou traversant présente des dispersions géométriques par rapport à l'embout, comme un défaut de coaxialité de la vis dans l'arbre creux par exemple. L'élasticité de la lèvre permet de garder l'appui radial entre la lèvre et le trou traversant, par déformation élastique de la lèvre. La forme de lèvre permet de tolérer les grandes dispersions géométriques de la vis ou, d'un point de vue montage, autorise une plus grande dispersion de positionnement de la canule par rapport au trou traversant. La forme de la lèvre permet aussi de faciliter un centrage de la canule par rapport au trou traversant.Indeed, the end piece and its elastic lip resting radially in the through hole makes it possible to seal the lubrication circuit and maintain the integrity of this seal even if the through hole has geometric dispersions relative to the end piece. , such as a defect in the coaxiality of the screw in the hollow shaft for example. The elasticity of the lip makes it possible to keep the radial support between the lip and the through hole, by elastic deformation of the lip. The shape of the lip makes it possible to tolerate the large geometric dispersions of the screw or, from an assembly point of view, allows a greater dispersion in the positioning of the cannula with respect to the through hole. The shape of the lip also makes it possible to facilitate centering of the cannula with respect to the through hole.

Ainsi, on voit que cette réalisation permet l'étanchéité du circuit d'huile tout en ayant un montage de la canule par rapport à la vis plus permissif en termes de dispersions géométriques.Thus, it can be seen that this embodiment allows the sealing of the oil circuit while having a mounting of the cannula with respect to the screw that is more permissive in terms of geometric dispersions.

De préférence, la lèvre élastique est positionnée dans la tête de la vis.Preferably, the elastic lip is positioned in the head of the screw.

En effet, cette configuration est avantageuse pour des facilités de montage de la canule et de son embout dans le trou traversant de la vis.Indeed, this configuration is advantageous for ease of mounting the cannula and its tip in the through hole of the screw.

Dans un mode de réalisation, le trou traversant présente au moins deux diamètres différents, et le diamètre du perçage de l'embout est égal ou supérieur au plus petit des diamètres du trou traversant.In one embodiment, the through hole has at least two different diameters, and the diameter of the hole in the tip is equal to or greater than the smallest of the diameters of the through hole.

En effet, pour ne pas rajouter une perte de charges à l'écoulement du lubrifiant dans le circuit de lubrification, il est avantageux que le diamètre de perçage de l'embout soit au moins égal au plus petit diamètre du trou traversant.In fact, in order not to add a pressure drop to the flow of lubricant in the lubrication circuit, it is advantageous for the bore diameter of the end piece to be at least equal to the smallest diameter of the through hole.

Dans un mode particulier de réalisation, la lèvre élastique a une conicité dont le sommet est orienté vers l'arbre creux.In a particular embodiment, the elastic lip has a taper, the apex of which is oriented towards the hollow shaft.

En effet, la lèvre élastique étant sous forme de tronc de cône pour pouvoir s'appuyer sur toute la périphérie du trou traversant, a un sens de montage privilégié. Il est alors avantageux que la lèvre élastique soit orientée dans le sens qui permet un glissement axial naturel de la lèvre élastique dans le trou traversant lorsque l'on introduit l'embout dans le trou traversant. Ceci a également pour avantage de ne pas altérer la lèvre lors de son montage dans le trou traversant.Indeed, the elastic lip being in the form of a truncated cone in order to be able to rest on the entire periphery of the through-hole, has a preferred mounting direction. It is then advantageous for the elastic lip to be oriented in the direction which allows natural axial sliding of the elastic lip in the through hole when the end piece is introduced into the through hole. This also has the advantage of not damaging the lip when it is mounted in the through hole.

Dans un mode particulier de réalisation, l'embout est surmoulé à la canule.In a particular embodiment, the end piece is molded onto the cannula.

En effet, ce mode de réalisation permet également de garantir la liaison mécanique et l'étanchéité au lubrifiant en même temps, entre la canule et l'embout.In fact, this embodiment also makes it possible to guarantee the mechanical connection and the lubricant seal at the same time, between the cannula and the nozzle.

Dans une variante, l'embout est emmanché sur la canule et maintenu par des clips.In a variant, the end piece is fitted onto the cannula and held by clips.

En effet, ce mode de réalisation simple permet de garantir la liaison mécanique et l'étanchéité au lubrifiant en même temps, entre la canule et l'embout.Indeed, this simple embodiment makes it possible to guarantee the mechanical connection and the lubricant-tightness at the same time, between the cannula and the nozzle.

Selon une caractéristique particulière, l'embout est en plastique, élastomère, ou polytétrafluoroéthylène.According to one particular characteristic, the end piece is made of plastic, elastomer, or polytetrafluoroethylene.

En effet, il est avantageux que l'embout et sa lèvre soient réalisés en une matière élastique, dont la raideur soit suffisante pour garantir l'appui radial de la lèvre dans le trou traversant.Indeed, it is advantageous that the end piece and its lip are made of an elastic material, the stiffness of which is sufficient to guarantee the radial support of the lip in the through hole.

Dans une variante, la lèvre élastique et l'embout sont réalisés en deux matières différentes par un procédé de bi-injection.In a variant, the elastic lip and the end piece are made of two different materials by a bi-injection process.

En effet, il est avantageux que l'embout soit réalisé en une première matière dont la raideur soit suffisante pour garantir le maintien mécanique de l'embout sur la canule, tout en ayant une lèvre élastique dans une deuxième matière dont l'élasticité soit suffisante pour garantir l'appui radial de la lèvre dans le trou traversant sans pour autant que l'appui radial soit excessif.Indeed, it is advantageous that the end piece is made of a first material whose stiffness is sufficient to guarantee the mechanical retention of the end piece on the cannula, while having an elastic lip in a second material whose elasticity is sufficient to ensure the radial support of the lip in the through hole without the radial support being excessive.

L'invention a également pour objet une boîte de vitesses comprenant au moins un circuit de lubrification tel que précédemment décrit.A subject of the invention is also a gearbox comprising at least one lubrication circuit as described above.

L'invention a également pour objet un véhicule comprenant au moins une boîte de vitesse tel que précédemment décrite.A subject of the invention is also a vehicle comprising at least one gearbox as described above.

D'autres caractéristiques, buts et avantages de l'invention apparaîtront à la lecture de la description des exemples de réalisation non limitatifs qui vont suivre, faite en référence à la figure 1 annexée, qui représente :

  • Figure 1 : un circuit de lubrification suivant un mode de réalisation de l'invention, pour une boîte de vitesses.
Other characteristics, aims and advantages of the invention will become apparent on reading the description of the non-limiting embodiments which follow, given with reference to figure 1 annexed, which represents:
  • Figure 1 : a lubrication circuit according to one embodiment of the invention, for a gearbox.

L'ensemble représenté sur la figure 1 comporte un circuit de lubrification d'un arbre tournant creux 6 comportant une canule fixe 3 d'amenée d'un lubrifiant, tel que de l'huile, dans une extrémité de l'arbre tournant creux 6, cette extrémité ayant une vis 7 coaxiale à l'arbre creux 6, cette vis 7 comprenant un trou coaxial traversant 11.The set represented on the figure 1 comprises a lubrication circuit for a hollow rotating shaft 6 comprising a fixed cannula 3 for supplying a lubricant, such as oil, into one end of the hollow rotating shaft 6, this end having a coaxial screw 7 to the hollow shaft 6, this screw 7 comprising a coaxial through hole 11.

Ce circuit de lubrification comporte en outre un embout 8 disposé en prolongement de la canule 3, cet embout 8 ayant un perçage axial 19 et une lèvre élastique 9, la lèvre élastique 9 étant en appui radial dans le trou traversant 11.This lubrication circuit further comprises a tip 8 arranged as an extension of the cannula 3, this tip 8 having an axial bore 19 and an elastic lip 9, the elastic lip 9 resting radially in the through hole 11.

La vis 7 de cet exemple comprend une tête de vis 12 et un corps de vis 13, et le trou traversant 11 présente deux diamètres constants différents dont le diamètre le plus grand est un alésage de tête 10 logé dans la tête de vis 12, la lèvre élastique 9 étant positionnée dans la tête de vis 12 et en appui sur l'alésage de tête 10. A l'état repos ou non monté dans le trou traversant 11, la lèvre 9 a un diamètre plus grand que celui de l'alésage de tête 10. Lorsque la lèvre 9 est positionnée dans l'alésage de tête 10, elle est comprimée de sorte à être précontrainte par son élasticité. Cette lèvre élastique 9 est précontrainte dans l'alésage de tête 10, de manière à pouvoir rester en appui sur l'alésage de tête 10 malgré des dispersions de géométrie et de positionnement de la vis 7 dans l'arbre tournant creux 6.The screw 7 of this example comprises a screw head 12 and a screw body 13, and the through hole 11 has two different constant diameters, the largest diameter of which is a head bore 10 housed in the screw head 12, the elastic lip 9 being positioned in the screw head 12 and resting on the head bore 10. In the rest state or not mounted in the through hole 11, the lip 9 has a larger diameter than that of the bore head 10. When the lip 9 is positioned in the head bore 10, it is compressed so as to be prestressed by its elasticity. This elastic lip 9 is preloaded in the head bore 10, so as to be able to rest on the head bore 10 despite dispersions in geometry and in the positioning of the screw 7 in the hollow rotating shaft 6.

La lèvre élastique 9 étant positionnée en appui sur cet alésage de tête 10, cela permet également de loger une partie de l'embout 8 dans cet alésage de tête 10. Le diamètre de perçage axial 19 de l'embout 8 est inférieur au diamètre d'un alésage de corps 15, cet alésage de corps 15 correspondant au diamètre du trou traversant 11 dans le corps de vis 13. Ce diamètre de l'alésage de corps 15 est le plus petit diamètre du trou traversant 11.The elastic lip 9 being positioned to rest on this head bore 10, this also makes it possible to accommodate a part of the end piece 8 in this head bore 10. The axial bore diameter 19 of the nozzle 8 is less than the diameter of a body bore 15, this body bore 15 corresponding to the diameter of the through hole 11 in the screw body 13. This diameter of the body bore 15 is the smallest diameter of the through hole 11.

Dans une variante de réalisation, le diamètre de perçage axial 19 de l'embout 8 est supérieur ou égal au diamètre de l'alésage de corps 15.In an alternative embodiment, the axial bore diameter 19 of the end piece 8 is greater than or equal to the diameter of the body bore 15.

L'alésage de tête 10 et l'alésage de corps 15 sont reliés par une partie tronconique du trou traversant 11, cette partie tronconique et ces deux alésages 10, 15, formant la totalité du trou traversant 11.The head bore 10 and the body bore 15 are connected by a frustoconical part of the through hole 11, this frustoconical part and these two bores 10, 15, forming the whole of the through hole 11.

Dans d'autres variantes de réalisation, le trou traversant 11 peut avoir toute autre forme, la lèvre 9 venant en appui sur un diamètre du trou 11 égal ou supérieur au plus petit des diamètres du trou 11.In other variant embodiments, the through hole 11 may have any other shape, the lip 9 bearing on a diameter of the hole 11 equal to or greater than the smallest of the diameters of the hole 11.

la lèvre élastique 9 a une conicité dont le sommet est orienté vers l'arbre creux 6.the elastic lip 9 has a taper, the apex of which is oriented towards the hollow shaft 6.

L'embout 8 est surmoulé à la canule 3, de sorte que la canule 3 sert également d'armature dans l'embout 8. Des aspérités 17 de la canule 3, comme des emboutis, des trous, ou des découpes, dépassent dans la matière de l'embout 8 de sorte à compléter la liaison mécanique entre ces deux pièces.The nozzle 8 is molded onto the cannula 3, so that the cannula 3 also serves as a frame in the nozzle 8. Asperities 17 of the cannula 3, such as stampings, holes, or cutouts, protrude into the nozzle. material of the end piece 8 so as to complete the mechanical connection between these two parts.

Dans une variante de réalisation, l'embout 8 est emmanché à force sur la canule 3, dans un diamètre intérieur à la canule 3, ou autour d'un diamètre extérieur à la canule 3, ou les deux à la fois.In an alternative embodiment, the end piece 8 is force-fitted onto the cannula 3, in a diameter inside the cannula 3, or around a diameter outside the cannula 3, or both at the same time.

Dans une variante de réalisation, l'embout 8 est emmanché sur la canule 3, et maintenu par des clips (non représentés). L'emmanchement est réalisé dans le diamètre intérieur à la canule 3, ou autour du diamètre extérieur à la canule 3, ou les deux à la fois. Les clips sont réalisés par complémentarité de forme entre la canule 3 et l'embout 8, en utilisant l'élasticité de la matière de l'embout 8.In an alternative embodiment, the end piece 8 is fitted onto the cannula 3, and held by clips (not shown). The fitting is made in the inner diameter of the cannula 3, or around the outer diameter of the cannula 3, or both at the same time. The clips are made by complementarity of shape between the cannula 3 and the tip 8, using the elasticity of the material of the tip 8.

L'embout 8 est en élastomère, matériau qui présente un compromis idéal entre raideur et élasticité, mais pourrait être aussi en plastique, notamment en polyamide et plus particulièrement en polyhexaméthylène adipamide PA6.6, ou à base de polytétrafluoroéthylène.The end piece 8 is made of elastomer, a material which presents an ideal compromise between stiffness and elasticity, but could also be made of plastic, in particular of polyamide and more particularly of polyhexamethylene adipamide PA6.6, or based on polytetrafluoroethylene.

Dans une variante de réalisation, la lèvre élastique 9 et l'embout 8 sont réalisés en deux matières différentes par un procédé de bi-injection. L'embout est alors réalisé en une première matière. La raideur de cette première matière est choisie pour être suffisante pour garantir le maintien mécanique de l'embout 8 sur la canule 9. La lèvre élastique 9 est réalisée dans une deuxième matière. L'élasticité de cette deuxième matière doit être suffisante pour garantir l'appui radial de la lèvre 9 dans le trou traversant 11, ici l'alésage de tête 10, sans pour autant que l'appui radial soit excessif.In an alternative embodiment, the elastic lip 9 and the end piece 8 are made of two different materials by a bi-injection process. The tip is then made of a first material. The stiffness of this first material is chosen to be sufficient to guarantee the mechanical retention of the end piece 8 on the cannula 9. The elastic lip 9 is made of a second material. The elasticity of this second material must be sufficient to guarantee the radial support of the lip 9 in the through hole 11, here the head bore 10, without the radial support being excessive.

Ce circuit de lubrification fait partie, par exemple, d'une boîte de vitesses 1 comprenant un empilement de pignons (non représentés) et de roulements 16 sur l'arbre creux 6, par exemple des pignons fous, et la vis 7 est un blocage de cet empilement sur l'arbre creux 6.This lubrication circuit is part, for example, of a gearbox 1 comprising a stack of gears (not shown) and of bearings 16 on the hollow shaft 6, for example idler gears, and the screw 7 is a blocking of this stack on the hollow shaft 6.

L'arbre creux 6 est tournant par rapport à un carter 2 de la boîte de vitesses 1, et la canule 3 est fixe par rapport à ce carter 2, et y est fixée par l'intermédiaire d'un couvercle 4 de carter 2. De la sorte, l'arbre creux 6 est en rotation par rapport à la canule 3. L'embout 8 étant en prolongement de la canule 3, l'arbre creux 6 est également en rotation par rapport à l'embout 8, ce dernier étant fixe par rapport à la canule 3.The hollow shaft 6 is rotating relative to a housing 2 of the gearbox 1, and the cannula 3 is fixed relative to this housing 2, and is fixed thereto by means of a cover 4 of the housing 2. In this way, the hollow shaft 6 is in rotation with respect to the cannula 3. The end piece 8 being an extension of the cannula 3, the hollow shaft 6 is also in rotation with respect to the end piece 8, the latter being fixed relative to the cannula 3.

Le couvercle 4 de carter 2, a un isostatisme (non représenté) par rapport au carter 2 de deux à trois degrés de liberté, et l'embout 8 est alors un centreur du couvercle 4.The cover 4 of the housing 2 has an isostatism (not shown) with respect to the housing 2 of two to three degrees of freedom, and the end piece 8 is then a centralizer of the cover 4.

Dans une variante de réalisation, le couvercle 4 de carter 2 a un isostatisme (non représenté) par rapport au carter 2 sans degrés de liberté. Toutes les dispersions géométriques issues d'une chaine de cotes reliant l'embout 8 au trou traversant 11 sont absorbées par l'élasticité de la lèvre 9.In an alternative embodiment, the cover 4 of the housing 2 has an isostatism (not shown) with respect to the housing 2 without degrees of freedom. All the geometric dispersions resulting from a chain of dimensions connecting the end piece 8 to the through hole 11 are absorbed by the elasticity of the lip 9.

La canule 3 alimente l'arbre creux 6 en huile par le moyen d'une pompe (non représentée) permettant la mise sous pression de l'huile. On peut aussi remplacer la pompe à huile par un système de récupération d'huile par gravité, pour des systèmes à lubrification par barbotage.The cannula 3 supplies the hollow shaft 6 with oil by means of a pump (not shown) allowing the oil to be pressurized. It is also possible to replace the oil pump with a gravity-fed oil recovery system, for splash lubrication systems.

La boîte de vitesses 1, est par exemple, intégrée dans la transmission d'un véhicule, en particulier d'un véhicule automobile.The gearbox 1 is, for example, integrated into the transmission of a vehicle, in particular of a motor vehicle.

Claims (10)

  1. Lubrication circuit of a hollow rotating shaft (6) comprising a fixed cannula (3) for supplying a lubricant into one end of said hollow rotating shaft (6), said end having a screw (7) coaxial with said hollow shaft (6), said screw (7) comprising a coaxial through hole (11), characterized in that it further comprises a tip (8) arranged as an extension of said cannula (3), said tip (8) having an axial bore (19) and an elastic lip (9), and in that the elastic lip (9) bears radially in said through hole (11).
  2. Lubrication circuit according to claim 1, said screw (7) comprising a screw head (12), characterized in that the elastic lip (9) is positioned in said screw head (12).
  3. Lubrication circuit according to claim 2, characterized in that said through hole (11) has at least two different diameters, and in that the diameter of the bore of said tip (8) is equal to or greater than the smallest of the diameters of the through hole (11).
  4. Lubrication circuit according to one of the preceding claims, characterized in that the elastic lip (9) has a taper the apex of which is oriented towards said hollow shaft (6).
  5. Lubrication circuit according to one of the preceding claims, characterized in that said tip (8) is molded onto said cannula (3).
  6. Lubrication circuit according to one of claims 1 to 4, characterized in that the said tip (8) is fitted onto the said cannula (3), and held by clips.
  7. Lubrication circuit according to one of the preceding claims, characterized in that said tip (8) is made of plastic, elastomer or polytetrafluoroethylene.
  8. Lubrication circuit according to one of claims 1 to 6, characterized in that the elastic lip (9) and said tip (8) are made of two different materials, in particular by a bi-injection process.
  9. Gearbox characterized in that it comprises at least one lubrication circuit according to one of the preceding claims.
  10. Vehicle characterized in that it comprises at least one gearbox according to Claim 9.
EP17713750.2A 2016-04-15 2017-03-13 Hollow shaft lubricant circuit Active EP3443243B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1653347A FR3050248B1 (en) 2016-04-15 2016-04-15 LUBRICATING CIRCUIT OF A HOLLOW TREE
PCT/FR2017/050559 WO2017178718A1 (en) 2016-04-15 2017-03-13 Hollow shaft lubricant circuit

Publications (2)

Publication Number Publication Date
EP3443243A1 EP3443243A1 (en) 2019-02-20
EP3443243B1 true EP3443243B1 (en) 2020-09-09

Family

ID=56101710

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17713750.2A Active EP3443243B1 (en) 2016-04-15 2017-03-13 Hollow shaft lubricant circuit

Country Status (4)

Country Link
EP (1) EP3443243B1 (en)
CN (1) CN109073069B (en)
FR (1) FR3050248B1 (en)
WO (1) WO2017178718A1 (en)

Family Cites Families (9)

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Publication number Priority date Publication date Assignee Title
JPS6246818U (en) * 1985-09-11 1987-03-23
FR2613015B1 (en) * 1987-03-24 1991-05-10 Renault DEVICE FOR ADDITIONAL SPEED RATING ON A MECHANICAL GEARBOX
DE10107706A1 (en) * 2001-02-19 2002-10-02 Rexroth Star Gmbh Rotary bearing with lubrication channel arrangement, screw drive with rotating screw nut
FR2877065B1 (en) 2004-10-22 2006-12-15 Renault Sas GEARBOX FOR A MOTOR VEHICLE COMPRISING A FORGED LUBRICATING DEVICE FOR GEAR WHEELS
JP4697299B2 (en) * 2008-12-19 2011-06-08 トヨタ自動車株式会社 Oil supply mechanism of power transmission device
CN201575117U (en) * 2009-10-16 2010-09-08 中国第一汽车集团公司 Single-oil-duct chain idle wheel assembly
FR2956460B1 (en) * 2010-02-17 2012-05-25 Peugeot Citroen Automobiles Sa TRANSMISSION DEVICE EQUIPPED WITH A LUBRICATION FLUID PUMP.
JP5551573B2 (en) * 2010-11-26 2014-07-16 株式会社ニフコ Lubricating oil collection guide
DE102013206880B3 (en) * 2013-04-17 2014-07-31 Schaeffler Technologies Gmbh & Co. Kg Oil catcher for a planetary gearbox

Non-Patent Citations (1)

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Title
None *

Also Published As

Publication number Publication date
CN109073069A (en) 2018-12-21
FR3050248B1 (en) 2018-04-13
CN109073069B (en) 2022-03-25
WO2017178718A1 (en) 2017-10-19
FR3050248A1 (en) 2017-10-20
EP3443243A1 (en) 2019-02-20

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